Isogloss

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Isoglosses on the Faroe Islands
High German subdivides into Upper German (green) and Central German (blue), and is distinguished from Low Franconian and Low German (yellow). The main isoglosses, the Benrath and Speyer lines, are marked in black.

An isogloss, also called a heterogloss (see Etymology below), is the geographic boundary of a certain linguistic feature, such as the pronunciation of a vowel, the meaning of a word, or the use of some syntactic feature. Major dialects are typically demarcated by groups of isoglosses such as the Benrath line distinguishes High German from the other West Germanic languages; and the La Spezia–Rimini Line divides the Northern Italian dialects from Central Italian dialects. However, an individual isogloss may or may not have any coincidence with a language border. For example, the front-rounding of /y/ cuts across France and Germany, while the /y/ is absent from Italian and Spanish words that are cognate with the /y/-containing French words.

One of the most well-known isoglosses is the centum-satem isogloss.

Similar to an isogloss, an isograph is a distinguishing feature of a writing system. Both concepts are also used in historical linguistics.

Examples

Centum-Satem isogloss

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The Centum-Satem isogloss of the Indo-European language family relates to the different evolution of the dorsal consonants of Proto-Indo-European (PIE). In the standard reconstruction, three series of dorsals are recognised:

Labiovelars: *kʷ, *gʷ, *gʷʰ
Velars: *k, *g, *gʰ
Palatals: *ḱ, , *ǵʰ

In some branches (for example Greek, Italic and Germanic), the palatals fell together with the velars: PIE *keup- "tremble (inwardly)" became Latin cupiō "desire" and *m̥tom "hundred" became Latin centum (pronounced [kentum]); but *o- "interrogative pronoun" became quō "how? where?". These branches are known as Centum branches, named after the Latin word for hundred.

In other branches (for example Balto-Slavic and Indo-Iranian), the labiovelars fell together with the velars: PIE *keup- became Vedic Sanskrit kopáyati "shaken" and *o- became Avestan "who?"; but *ḱm̥tom became Avestan satəm. These branches are known as Satem branches, named after the Avestan word for hundred.[1][2]

North-Midland isogloss (American English)

A major isogloss in American English has been identified as the North-Midland isogloss, which demarcates numerous linguistic features, including the Northern Cities vowel shift: regions north of the line (including Western New York; Cleveland, Ohio; lower Michigan; northern Illinois; and eastern Wisconsin) have the shift, while regions south of the line (including Pennsylvania, central and southern Ohio, and most of Indiana) do not.

Northwest Semitic

Lua error in package.lua at line 80: module 'strict' not found. A feature of the ancient Northwest Semitic languages is the following: w- > y- (w becomes y at the beginning of a word). Thus, in Proto-Semitic and subsequent non-Northwest Semitic languages and dialects, the root letters for a word for "child" were w-l-d. However, in the ancient Northwest Semitic languages, the word was y-l-d, that is, with w- > y-.

Similarly, Proto-Semitic ā (long a) becomes ō (long o) in the Canaanite dialects of Northwest Semitic.[3] Note that within the Aramaic languages and dialects of Northwest Semitic, the historic ā is preserved. Thus, an ancient Northwest Semitic language in which historic ā becomes ō can be classed as part of the Canaanite branch of Northwest Semitic.

Such features can be used as data of fundamental importance for the purposes of linguistic classification.

Isographs

Just as there are distinguishing features of related languages, there are also distinguishing features of related scripts (for a discussion of writing systems, see The World's Writing Systems[4]).

For example, a distinguishing feature of the Iron Age Old Hebrew script is the fact that the letters bet, dalet, 'ayin, and resh do not have an open head, but Aramaic of the same period has open-headed forms. Similarly, the bet of Old Hebrew has a distinctive stance (it leans to the right), but the bet of the Aramaic and Phoenician scripts series has a different stance (both lean to the left).

Recently, Christopher Rollston has suggested using the term isograph to designate a feature of the script that distinguishes it from a related script series (such as a feature that distinguishes the script of Old Hebrew from Old Aramaic and Phoenician).[5]

Etymology

The term isogloss (Ancient Greek ἴσος ísos "equal, similar" and γλῶσσα glōssa "tongue, dialect, language") is inspired by contour lines or isopleths such as isobar. However, the isogloss separates, rather than connects, points. Consequently, it has been proposed for the term heterogloss (ἕτερος héteros "other") to be used instead.[6]

See also

References

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Bibliography

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External links